Remember we said not to confuse mass with pressure. The amount of water with the same height will give the same pressure at the bottom no matter how many gallons are in the tank or the size of the pipe. PSI under static conditions, we must note several items. To illustrate the effects in relationship of head vs. We may have run 1000 feet to rise 92.4 feet, but either way, we will have 40 PSI to overcome to pump water to the top of the hill. We simply take 40 PSI x 2.31 which equals 92.4. If the gauge reads 40 PSI when the hose is filled with water, we know that the elevation is 92.4 feet. If we take a garden hose or tub and run it up the hill, put a pressure gauge at the bottom, then fill the hose or tube with water, we can tell what the elevation is on the hill. We don't have time for a surveyor, or the money, but we still need to know the elevation change from lake level to cottage. Let's say we have a lake cottage on the top of the bank, and we want to know how much pressure our pump needs to push the water to the top of the hill. So, let's apply this knowledge to practical use: If you lift our 1 cubic foot of water to 23.1 feet of elevation, we will only generate 10 PSI of pressure at the bottom where we started, as opposed to the 62.37 pounds mass we lifted up in the air. If you have 1 cubic foot of water holding 7.48 gallons, and the weight of one gallon of water being 8.33 pounds, you'll get 62.37 pounds per cubic foot of water.īut don't become confused with mass and pressure.
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How to covert weight of a cubic foot of water:
You decide the simplest solution is to place your thumb over the end of the hose as opposed to walking the distance to the tomatoes. It’s been a long week and you are tired and don’t want to walk all the way across the garden. You are watering your garden, but you can’t quite reach the tomatoes that are at the back of the garden.
Still not sure what is happening? Picture for a moment a water hose that you hold in your hands. Using XYZ123 pump, how much pressure will we have at 40’? Now, let’s say that we only need to pump water a total of 40’ high. In the example above, we could say that XZY123 pump is capable of a maximum of 100 feet of total dynamic head (total head feet) and a maximum pounds per square inch of 43.29 PSI. The dead head of a water pump simply means that there is zero (0) flow of water at the maximum total distance of head. However, this would be at what is called “dead head”. So what is the maximum pounds per square inch? XYZ123 pump is capable of pumping a maximum of 100 feet of total dynamic head. We are looking to purchase a pump, that we will call Model number: XYZ123. So, let's do a short conversion exercise: Becoming familiar with the units and where they come from will make your work easier and faster. When working with pumps and plumbing, you'll work between feet of head and PSI routinely. As we work through a problem, we need to convert to the unit that is most common – feet of head. 433 and 2.31, are the conversion numbers used to convert from one unit to the other.Īs we learned in school, to solve a problem we need to be in common units. Or, one-foot column of water that's 1-inch square weighs. Translated, that means that a column of water that's 1-inch square and 2.31 feet tall will weigh 1 pound. The relationship between PSI and feet of head is that 2.31 feet of head = 1 PSI. As we size a pumping system, we'll want to accomplish building pressure (PSI).
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